Natively supported GPU not recognized

Okay,

I need OS X Mavericks on my computer for some old software. I thought this would be easy because my HD Graphics 5200 is natively supported by 10.9, but for some reason it cant load the GPU Driver. I tried to inject a different device id and framebuffer using OpenCore, but that had no effect. How can I force OS X to use a GPU that is NATIVELY SUPPORTED but for some reason not recognized?

submitted by /u/OneAd1466
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